Drawmer DSL424 User manual

Brand: Drawmer

Model: DSL424

Category: Audio mixers

Type: User manual

Drawmer DSL424 is a 1U four-channel comprehensive toolbox capable of solving the most complex dynamic problems. It combines the gates of the DS404 with the compressor/limiters of the DL441 to provide a versatile 1U problem solver. DSL424 is ideally suited for use over a wide range of input signals, ranging from drums and other percussive instruments through to vocals, pianos and even complete mixes. Its highly developed, auto attack/release system adapts itself to the programme material being processed and is equally effective on individual sounds or complex mixes.

DRAWMER

DSL424

TwoPlusTwo

DYNAMICS

OPERATOR’S MANUAL

CONTENTS

Warranty

Safety Consideration

Chapter 1 - Introduction

Introduction

Installation

Audio Connections

Power Connection

Chapter 2 - Control Description

The Noise Gate Channels

The Compressor / Limiter Channels

The Quick Setup Procedure

Chapter 3 - Operation

The Noise Gate Channels

The Compressor / Limiter Channels

Chapter 3 - General Information

If a fault develops

Contacting Drawmer

Specification

Block Diagram

Session Recall Sheet

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DRAWMER DSL424 OPERATOR’S MANUAL

Drawmer Electronics Ltd., warrants the Drawmer DSL424

TwoPlusTwo Dynamics to conform substantially to the

specifications of this manual for a period of one year from the

original date of purchase when used in accordance with the

specifications detailed in this manual. In the case of a valid

warranty claim, your sole and exclusive remedy and Drawmer’s

entire liability under any theory of liability will be to, at Drawmer’s

discretion, repair or replace the product without charge, or, if

not possible, to refund the purchase price to you. This warranty

is not transferable. It applies only to the original purchaser of

the product.

For warranty service please call your local Drawmer dealer.

Alternatively call Drawmer Electronics Ltd. at +44 (0)1709

527574. Then ship the defective product, with transportation

and insurance charges pre-paid, to Drawmer Electronics Ltd.,

Coleman Street, Parkgate, Rotherham, S62 6EL UK. Write the

RA number in large letters in a prominent position on the

shipping box. Enclose your name, address, telephone number,

copy of the original sales invoice and a detailed description of

the problem. Drawmer will not accept responsibility for loss or

damage during transit.

This warranty is void if the product has been damaged by

misuse, modification or unauthorised repair.

THIS WARRANTY IS IN LIEU OF ALL WARRANTIES,

WHETHER ORAL OR WRITTEN, EXPRESSED, IMPLIED OR

STATUTORY. DRAWMER MAKES NO OTHER WARRANTY

EITHER EXPRESS OR IMPLIED, INCLUDING, WITHOUT

LIMITATION, ANY IMPLIED WARRANTIES OF

MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE,

OR NON-INFRINGEMENT. PURCHASER’S SOLE AND

EXCLUSIVE REMEDY UNDER THIS WARRANTY SHALL BE

REPAIR OR REPLACEMENT AS SPECIFIED HEREIN.

IN NO EVENT WILL DRAWMER ELECTRONICS LTD. BE

LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL

OR CONSEQUENTIAL DAMAGES RESULTING FROM ANY

DEFECT IN THE PRODUCT, INCLUDING LOST PROFITS,

DAMAGE TO PROPERTY, AND, TO THE EXTENT PERMITTED

BY LAW, DAMAGE FOR PERSONAL INJURY, EVEN IF

DRAWMER HAS BEEN ADVISED OF THE POSSIBILITY OF

SUCH DAMAGES.

Some states and specific countries do not allow the exclusion

of implied warranties or limitations on how long an implied

warranty may last, so the above limitations may not apply to

you. This warranty gives you specific legal rights. You may

have additional rights that vary from state to state, and country

to country.

In the interests of product development, Drawmer reserve the right to modify or

improve specifications of this product at any time, without prior notice.

ONE YEAR LIMITED WARRANTY

This manual is copyrighted

laws, no part of this publication may be reproduced, transmitted, stored in a retrieval system or translated

into any language in any form by any means, mechanical, optical, electronic, recording, or otherwise, with-

out the written permission of Drawmer Electronics Ltd.

DRA WMER

DSL424

Dual Channel

Vacuum Tube Compressor

SAFETY CONSIDERATIONS

CAUTION - MAINS FUSE

TO REDUCE THE RISK OF FIRE

REPLACE THE MAINS FUSE ONLY WITH

A FUSE THAT CONFORMS TO IEC127-2.

250 VOLT WORKING, TIME DELAY TYPE

AND BODY SIZE OF 20mm x 5mm.

THE MAINS INPUT FUSE MUST BE

RATED AT 230V=T125mA and 115V=T250mA.

CAUTION - MAINS CABLE

DO NOT ATTEMPT TO CHANGE

OR TAMPER WITH THE

SUPPLIED MAINS CABLE.

CAUTION - SERVICING

DO NOT PERFORM ANY SERVICING.

REFER ALL SERVICING TO QUALIFIED

SERVICE PERSONNEL.

WARNING

TO REDUCE THE RISK OF FIRE OR

ELECTRIC SHOCK DO NOT EXPOSE

THIS EQUIPMENT TO RAIN OR MOISTURE.

DRAWMER DSL424 OPERATOR’S MANUAL

DRAWMER

DSL424

TWOPLUSTWO DYNAMICS

The DSL424 provides the engineer with a 1U four channel

comprehensive toolbox capable of solving the most

complex dynamic problems. Incorporated in the 1U

package are two industry standard frequency conscious

noise gates and two soft/hard knee compressors with

variable threshold limiting. The channels may be front panel

configured as four individual stand alone processors, a

stereo linked pair of comp/limiters with a stereo linked

pair of gates. Alternatively, any combination of processing

can be achieved by rear panel patching.

The DSL424 combines the gates of the DS404 with the

compressor/limiters of the DL441 to provide a versatile 1U

problem solver invaluable in applications where rack space

is limited.

Recognizing that there are many general applications

which require equipment that is simple to operate, Drawmer

have designed the noise gate stages of the DSL424 utilizing

‘Programme Adaptive’ circuitry. This makes the DSL424

ideally suited for use over a wide range of input signals,

ranging from drums and other percussive instruments

through to vocals, pianos and even complete mixes.

The provision of variable Low-Pass and High-Pass Filters

allows ‘without compromise’ frequency selective gating

with a KEY LISTEN facility enabling monitoring of the filter

setting.

Each gate channel can be operated as HARD - offering

ultra-fast response time, stable triggering and a specialized

release contour which is ideally suited to percussive

material or SOFT - a versatile Expander capable of handling

vocals and sub mixes.

Noise Gate

• Variable High/Low Pass Filters for frequency triggering

• Auto attack

• Variable release

• Switchable range with LED status

• Selectable ‘Hard’ (drums etc.) or ‘Soft’ (vocals etc.)

• 1/4 inch jack Key Inputs

• Key Listen facility

• Slave linking

CHAPTER 1

INTRODUCTION

The compressor section features a highly developed, auto

attack/release system which adapts itself to the

programme material being processed and is equally

effective on individual sounds or complex mixes.

To maximise flexibility, each channel of the DSL424 is

switchable between traditional ratio (hard knee) and

soft-knee operation. Traditionally, soft-knee compressors

are preferable for unobtrusive level control or for the control

of finished mixes, whereas ratio type compressors are

generally considered more successful in creative

applications or where large amounts of gain reduction are

required. By offering a choice of both modes, the DSL424

is capable of outstanding results in a very wide range of

studio and live sound situations. The two channels may

be operated independently or linked for true stereo

operation.

Also included in each channel of the DSL424 is a peak

limiter which allows the user to set an absolute output

signal level that will not be exceeded. If the peak limiter

threshold is exceeded for more than a few milliseconds,

additional gain reduction will be applied to reduce the overall

signal level to within accepted limits without distortion.

Once the peak has passed, the system gain will return to

normal after a period of about one second. This facility is

extremely valuable both in live sound applications, for driver

protection, and in digital recording where an absolute

maximum recording level exists. Furthermore, when

deliberately overdriven, it can be used creatively to produce

level “pumping” effects which can be useful on electric

guitar or rock vocal sounds.

Compressor/Limiter

• Switchable Hard/Soft knee compression with variable

threshold, ratio and output gain

• Auto attack/release

• Variable ‘zero overshoot’ transparent limiter

• High resolution bargraph metering of gain reduction

and input/output level

• Stereo linking

• Balanced +4dB XLR in/out

DRAWMER DSL424 OPERATOR’S MANUAL

The DSL424 is designed for standard 19" rack mounting

and occupies 1U of rack space. Avoid mounting the unit

directly above power amplifiers or power supplies that

radiate significant amounts of heat and always connect

the mains earth to the unit. Fibre or plastic washers may

be used to prevent the front panel becoming marked by

the mounting bolts.

INSTALLATION

AUDIO CONNECTIONS

The inputs and outputs are electronically balanced on conventionally wired XLRs (pin 1 screen, pin 2 hot, pin 3 cold and

XLR shell is connected to chassis). The operating level is nominally +4dBu. Balanced use is recommended.

• Interference:

If the unit is to be used where it maybe exposed to

high levels of disturbance such as found close to a TV

or radio transmitter, we advise that the unit is operated

in a balanced configuration. The screens of the signal

cables should be connected to the chassis connection

on the XLR connector as opposed to connecting to

pin1. The DSL424 conforms to the EMC standards.

• Ground Loops:

If ground loop problems are encountered, never dis-

connect the mains earth, but instead, try disconnect-

ing the signal screen on one end of each of the cables

connecting the outputs of the DSL424 to the patchbay.

If such measures are necessary, balanced operation

is recommended.

The unit will have been supplied with a power cable suitable for domestic power outlets in your country. For your own

safety it is important that you use this cable. The unit should always be connected to the mains supply earth using this

cable, and no other.

If for some reason the unit is to be used at a mains input operating voltage which is different to that as supplied, the

following procedure must be carried out :

POWER CONNECTION

Disconnect the unit from the mains.

Remove the two self-tapping screws

that hold the voltage selection switch

cover-plate onto the rear panel.

Remove the cover plate and slide the

switch fully to its opposite end.

Rotate the cover plate one half turn,

(180 degrees) and refit the two screws.

Replace with a correctly rated fuse for

the selected operation voltage.

Re-connect to mains power source.

Never disconnect the earth

from the mains supply

115V Setting

230V Setting

DRAWMER DSL424 OPERATOR’S MANUAL

CONTROL DESCRIPTION

Both gate channels of the DSL424 are identical and may be used completely independently or linked for stereo channel

operation. In the linked mode, only the left channel’s controls are functional and serve as master, though the channel

bypass switches remain independent. When linked, the control signal is derived only from the programme material

present at the input of the master channel.

Threshold: Sets the level below which gating starts to take place and may be set in the range -70dB to +20dB.

Display The famous Drawmer traffic light display shows gate status

Gate Closed Hold Time Gate Open

Release 10mS to 5S.

Additionally, some envelope hold time is built into the system which varies with the release time.

This prevents chatter when processing material with inconsistent decay characteristics and is

quite invisible to the user.

Range Determines how much gain reduction is applied when the gate is fully closed. A setting of -90dB

effectively silences the signal completely, while the -20dB setting will still allow an attenuated

version of the signal to pass through. We recommend this switch is left in the -90dB (out)

position.

For signals with a high levels of background noise, the very fact of closing down to -90dB can be

disconcertingly noticeable. In such cases the -20dB switch setting can achieve better results.

Note: This control is active on both channels, even in stereo linked operation.

Key Listen / Gate / Bypass

When this switch is set to Key Listen, the effect of the key filters on the programme material is

heard at the output. In normal operation, the Gate position is selected; the filters only affect the way

the DSL424 responds to the incoming programme material - they do not have any direct effect on

the output signal. The Bypass position routes the input signal to the output with no processing.

Note: It is possible to leave the switch in the Key Listen position in order to use the DSL424

simply as a filter rather than a gate.

The Noise Gate Channels

CHAPTER 2

Noise Gate 1 Noise Gate 2 Compressor 1 Compressor 2

DRAWMER DSL424 OPERATOR’S MANUAL

L.F. 25Hz - 10kHz

The Low Frequency filter works by severely attenuating frequencies below the cut-off frequency

selected.

H.F. 200Hz - 35kHz

The High Frequency filter attenuates frequencies above the selected cut-off value. In other words,

when both filters are set, it is the range between the two settings that is allowed to pass.

Ext/Int In the INT position, this switch causes the gate to respond to the dynamics of the signal being

processed.

In the EXT position, an external audio signal fed to the key input is used to control the gate, making

it possible to gate one sound using another, independent signal.

Gating This button selects between the Hard and Soft modes of operation. In the Hard mode, the DSL424

Hard/Soft behaves as a fast, conventional gate while in Soft mode, it performs as a programme adaptive

expander. Hard mode is signified by a red status LED while the Soft mode is identified by a yellow

LED. If two channels are linked, the mode is determined by the master (left) channel and the

Hard/Soft LEDs on the slave channel will extinguish.

Master Link When the link button is depressed, the gate 2 channel on the right is controlled by the gate 1 left

hand channel. In linked mode, the red status LED beneath the Slave Link switch will be illuminated,

and both the yellow and red HARD/SOFT LEDs of the slave channel will be extinguished. This

assists to show that the only controls of the slave channel that still function are the Key Listen /

Gate / Bypass switch and the Range switch.

The Noise Gate Channels cont...

Both compressor channels of the DSL424 are identical and may be used completely independently or linked for stereo

operation. In the linked mode, only the left hand channel (compressor 1) controls are functional and serve as master

controls, though the channel bypass switches remain independent. In linked mode, the compressor/limiters and peak

limiters of the two linked channels track together to avoid the inevitable image shifting that occurs if the two channels of

a stereo signal are treated independently.

Compressor

Threshold Determines the input level above which gain reduction will be applied and may be set in the range

-40 to +20dB. When Soft Knee compression is selected, the onset of compression is progressive

over an input range of approximately 15dB, above which level conventional ratio compression is

applied. For this reason, the signal level may appear to fall when the compressor is switched from

Hard to Soft Knee operation and some readjustment of the threshold setting may be required.

Knee Selects Hard or Soft Knee operation. In general, the Soft Knee mode provides the least obtrusive

Hard/Soft gain control and is often the preferred setting when treating finished mixes.

The Compressor/Limiter Channels

DRAWMER DSL424 OPERATOR’S MANUAL

THE QUICK SETUP PROCEDURE

Quickly Setup the Gate

Select the Key trigger source.

Select Key Listen, and trim down to the desired

frequency for triggering the Gate using the HFand LF

Key filters.

Select the desired amount of reduction using Range.

Normally fully counter clockwise.

Set the Attack, Hold. Decay and Range controls. For

a programme with long legato release, then Release will

also need to be long. Eg. Piano with reverb. For material

with much low frequency content, the Attack will need

to be quite slow, unless a ‘click’ is desired.

Using the Traffic Light LED display, rotate the Threshold

until some gating activity can be seen. As a rule, the

Threshold will need to be about 3dB below the average

input level to both see and hear the dynamic processing.

Ratio Sets the final compression ratio that will be applied once the threshold level is exceeded. The ratio

may be continuously adjusted from 1.2:1 to infinity:1 allowing the possibility of true hard limiting.

Gain During compression, the signal is attenuated depending on the dynamics of the signal. As a result,

gain may need to be applied in order to produce the desired output level. The GAIN control has a

range of -20dB to +20dB. If the limiter is in operation, only increase GAIN until the limiter operates

on signal peaks. Any further GAIN will just cause excessive limiting, thus reducing the effect of the

compressor.

Bypass This switch will disable the functioning of the Compressor section and the Peak Limiter. If operating

in Stereo Linked mode, both linked compressor channels will be bypassed simultaneously.

Gain Reduction Meter

An eight segment LED bargraph meter continuously monitors the gain reduction applied by the

compressor/limiter over the range 0 to 30dB.

Output Level Meter

This is a 5-segment LED bargraph level meter that monitors the level of the output signal over the

range -10dB to +10dB.

Peak Limiter

Level This control sets an absolute limit to the level that the output signal will not be permitted to exceed.

This limiter is very fast acting enabling it to control any peaks without audible distortion. If the output

signal is so high as to cause the limiter to operate for more than 20mS, the system gain is

automatically reduced to bring the signal back within range. The system gain is then returned to

normal over a period of approximately one second.

The compressor Gain control should be used to ensure that the peak limiter operates only rarely

if at all if the limiter is to be used purely for peak protection. Alternatively, the unit may be

deliberately driven into limiting to produce creative effects.

•

Quickly Setup the Compressor/Limiter

Select Hard Knee if compressing percussive tracks and

Soft Knee for vocals.

Ensure the Limiter control is fully clockwise.

From the programme material, set the Ratio. The ratio

setting depends on how firmly the signal dynamics need

controlling; as a rule, higher ratios provide a higher

degree of control but also tend to be more audibly

apparent in operation when high levels of gain reduction

are required. In general, we suggest less than 2.5:1 for

vocals, less for full mixes, and more for dynamic single

tracks.

Using the VU meter and the Compressor Gain Reduction

(GR) meter, rotate the Threshold until some GR activity

can be seen. As a rule, the Threshold will need to be

about 6dB to 10dB below the average input level to both

see, and hear, much change.

Adjust the Gain to give the desired amount of level on

the VU Meter.

Adjust the Peak Limiter so that the limiter led only lights

on signal extreme peaks.

•

DRAWMER DSL424 OPERATOR’S MANUAL

OPERATION

The Noise Gate Channels

CHAPTER 3

The unit should be connected in-line with the signal to be

processed via suitable insert points. Ensure, where

possible, that the insert send and return level on your

console approximately matches the operating level of the

DSL424.

For mono use, each channel may be considered as being

completely independent and set up accordingly. For use

with stereo signals, all setting up is then done using the

noise gate 1 (left) channel's controls.

For percussive material such as drums, fast synthesised

sounds or percussive bass guitar, the Hard mode of

operation will give the fastest response. However, with

material having a slower attack, the Hard setting may

produce transient clicks at the beginning of sounds in

which case the Soft setting may produce better results.

Initially, the Low filter should be set fully anti-clockwise

while the High filter should be set fully clockwise. This will

allow the full audio spectrum of the input programme to be

monitored by the side-chain control circuitry. Set the

Range control to -90dB and the output selector switch to

Normal.

With the release control set at its mid-way position, Range

set to -90dB and with suitable programme material fed

into the DSL424, increase the Threshold level from its anti-

clockwise position until the gate starts to operate. This

will be indicated by the activity of the traffic light LEDs

and you should also hear the effect on the outputs signal

in that pauses in the programme will now be silent. If the

threshold setting is too high, the gate will start to cut out

wanted pieces of programme so you should adjust it to as

low a setting as possible consistent with the effective

removal of low level noise. If the ends of sounds are

obviously being truncated, then a longer release time may

help. On the other hand, if unwanted noise is audible after

the wanted sound has ended, a shorter release time may

well be more appropriate.

There are circumstances when the programme material is

corrupted not only by unwanted random noise, but by some

other sound. For example, in a multi-miked drum kit setup,

some hi-hat will inevitably leak into the snare mic, some

snare drum into the kick drum mic and so on. Equally,

when recording on location, you may experience problems

due to wind or traffic noise or close-by conversation. If the

unwanted noise is different in pitch to the wanted sound,

it is often possible, by using the Key Listen facility, to use

the filters to 'tune' into the wanted sound while excluding

as much of the unwanted sound as possible. Used

carefully, these filters can significantly increase the gate's

immunity to false triggering.

LINKED OPERATION

It is important to note that when linked, the control signal

is derived entirely from the noise gate 1 channel. This

means that stereo signals where one channel differs

significantly from another may fare better if the channels

are not linked.

On the other hand, this mode of linking is very powerful in

synchronizing the start and finish of sounds, a typical

application being to tighten up backing vocals. If one singer

tends to finish notes on time while the other hangs on too

long, the correct version can be used as the master to

ensure that both finish at the same time. Similarly, one

sound can be used to gate another without having to resort

to patching in an external key signal. An example might

be to gate a low frequency tone from a bass drum signal

and then add this gated tone to the drum sound to add

depth.

DIFFICULT MATERIAL

As with any other gate, noise can only be removed during

pauses in the wanted material. If the noise contamination

is serious enough to be evident even during moderately

loud programme material, then simple gating will do little

to help. Indeed, the very fact that the gate produces near-

perfect silence during pauses can make the noise content

of the programme material seem even worse. In marginal

cases, setting the range control to -20dB rather than -

90dB will adequately reduce the noise during pauses but

not sufficiently to cause an unacceptably dramatic change

in noise level as the gate opens and closes.

More sophisticated processors such as the Drawmer

DF330 are better able to cope with excessive noise as

they adaptively filter the programme so as to mask the

noise during low level passages or where there is little

high frequency content present to mask it. However, the

key filters in the DSL424 may also be used to good effect,

particularly in situations where the wanted signal does

not occupy the full audio spectrum.

DRAWMER DSL424 OPERATOR’S MANUAL

Taking the example of the electric guitar, this produces

little below 100Hz or above 3kHz so setting one channel

of the DSL424 to Key Listen mode will enable you to use

the filters to exclude much of the amplifier hum at the low

end and hiss at the top end while having little effect on the

sound of the guitar. Surprisingly, the same is true of the

acoustic guitar; (even a bright-sounding steel-strung

model), and the filters can be used to reduce the effect of

string squeak or the player's breathing.

Other applications of the filter section include shaping DI'd

electric guitar sounds to remove unpleasant overtones and

to simultaneously clean and warm up digital synthesizer

sounds. While we should always endeavour to get the

highest quality of programme material at source, every

engineer is occasionally confronted with inferior material

from sources beyond his control. Conventional equalisers

seldom have a sharp enough response to duplicate the

function of the Key filters which invariably results in the

wanted material being filtered as well as the unwanted

noise. Once a signal has been filtered in this way, it may

also be processed by the second channel of the DSL424

to apply conventional gating.

The unit should be connected in-line with the signal to be

processed via suitable insert points. For mono use, each

channel may be considered as being completely

independent and set up accordingly. For use with stereo

signals such as complete mixes or submixes, the

channels should be switched to Stereo Link mode and all

setting up done using the compressor 1 (left compressor)

channel controls.

Setting up is simplified by the auto attack and release

system which continually optimises the attack and release

times to suit the dynamics of the material being processed.

The ratio setting depends on how firmly the signal dynamics

need controlling; as a rule, higher ratios provide a higher

degree of control but also tend to be more audibly apparent

in operation when high levels of gain reduction are

required. In general, a higher compression ratio may be

used when in Soft Knee mode without compromising the

subjective sound quality.

Having selected Hard or Soft Knee and set a suitable Ratio,

setting up is simply a matter of adjusting the Threshold

control until the desired amount of gain reduction occurs.

This is judged partly by ear and partly by observing the

gain reduction meter. Normally a maximum gain reduction

of between 8dB and 12dB will be adequate. If more gain

reduction appears necessary, it is worth considering

applying a conservative degree of compression during

recording and then further compression while mixing.

Compressing during a mix does increase the subjective

level of tape and other background noises during pauses

and quiet passages as maximum gain is applied when

the signal level is minimum. For this reason, it is unwise

to use more compression than is strictly necessary.

However, using the DSL424 the signal can be patched

through the gate, either before or after the compressor, to

remove any unrequired sounds.

Finally, the Gain control may be set to provide the required

output level using the level meter as a guide. Avoid running

at very high output levels as this reduces the available

amount of signal headroom and could lead to distortion in

extreme cases. Once the gain is correct, the Peak limiter

Level control should be adjusted so that the limiter LED

only lights briefly on extreme signal peaks. Alternatively,

the Peak limiter Level may first be set to the desired value

and then the compressor Gain control adjusted to ensure

minimum limiter activity.

The Peak limiter has no bypass control, but turning the

Level control fully clockwise will effectively prevent the

limiter from operating.

Compressors are often accused of dulling the sound being

processed, but the auto circuitry in the DSL424 has been

designed to allow transient sounds to pass through

cleanly, thus maintaining the clarity and transparency of

the original source. Soft Knee operation is usually

preferable when unobtrusive gain control is required.

The Compressor / Limiter Channels

DRAWMER DSL424 OPERATOR’S MANUAL

IF A FAULT DEVELOPS

For warranty service please call Drawmer Electronics Ltd. or

their nearest authorised service facility, giving full details of

the difficulty.

A list of all main dealers can be found on the Drawmer

webpages.

On receipt of this information, service or shipping instructions

will be forwarded to you.

No equipment should be returned under the warranty without

prior consent from Drawmer or their authorised representative.

For service claims under the warranty agreement a service

Returns Authorisation (RA) number will be issued.

Write this RA number in large letters in a prominent position

on the shipping box. Enclose your name, address, telephone

number, copy of the original sales invoice and a detailed

description of the problem.

Authorised returns should be prepaid and must be insured.

All Drawmer products are packaged in specially designed

containers for protection. If the unit is to be returned, the original

container must be used. If this container is not available, then

the equipment should be packaged in substantial shock-proof

material, capable of withstanding the handling for the transit.

CONTACTING DRAWMER

Drawmer Electronics Ltd., will be pleased to answer all

application questions to enhance your usage of this

equipment. Please address correspondence to:

Drawmer (Technical Help line)

Coleman Street

Parkgate

Rotherham

S62 6EL

Alternatively contact us by E-mail on :

tech@drawmer.com

Further information on all Drawmer dealers, Authorised service

departments and other contact information can be obtained

from our web pages on:

http://www.drawmer.com

GENERAL INFORMATION

CHAPTER 4

It is the responsibility of the installer to ensure that the continuous power rating of the speakers is not exceeded, as Drawmer

Electronics Ltd will not accept any responsibitlity for speaker damage caused by incorrect settings.

DRAWMER DSL424 OPERATOR’S MANUAL

NOISE GATE CHANNELS

INPUT

Input Impedance 20k Ohms (Balanced)

Key Input Impedance 20k Ohms (Unbalanced)

Max Input level +21dBu

Max Key Input Level +21dBu

OUTPUT

Output Impedance 50 Ohms (Balanced)

Output Level +21dBu

Bandwidth <10Hz to 22kHz -1dB

Floor Level -90dB, (or -20dB)

Noise

Distortion

DSL424 TWOPLUSTWO DYNAMICS

DATA SPECIFICATION

Power Requirements 115Volt or 230Volt at 50-60Hz, 15VA

Fuse Type CONFORMS TO IEC127-2.

Fuse Rating 230V=T250mA, 115V=T125mA.

Case Size 482mm (w) x 44mm (h) x 190mm (d)

Weight (incl packaging) 3.7 Kgs

Wideband 22Hz-22kHz CCIR IEC A Q-Pk CCIR

AV -91dB -97dB -97dB -100dB -86dB

RMS -89dB -96dB -99dB

COMPRESSOR / LIMITER CHANNELS

INPUT

Input Impedance 20k Ohms (Balanced)

Max Input level +21dBuB (+17dB ref. +4dBu)

OUTPUT

Output Impedance 50 Ohms (Balanced)

Output Level +20dBu

Bandwidth <12Hz to 35kHz -1dB

Crosstalk @10kHz Better than -80dB

@20kHz Better than -75dB

Output Balance Better than 40dB 20Hz to 10kHz

Noise at Unity Gain ref. +4dBu

Distortion

Wideband 22Hz-22kHz CCIR IEC A Q-Pk CCIR

AV -90dB -98dB -99dB -100dB -88dB

RMS -89dB -96dB -97dB -98dB

100Hz 1kHz 10kHz

Gate Open with +4dB Input <0.04% <0.04% <0.04%

100Hz 1kHz 10kHz

Unity Gain, +4dB Input <0.02% <0.015% <0.035%

DRAWMER DSL424 OPERATOR’S MANUAL

BLOCK DIAGRAM

DSL424 ver 01 B 29/06/04

DRAWMER DSL424 OPERATOR’S MANUAL

DRAWMER ELECTRONICS LTD ~ Coleman Street

Rotherham ~ S. Yorkshire ~ UK

Session No.

Tape Location

Artist

Date

Session Recall

DSL424

HARD HARD

HARDHARD

SOFT SOFT

SOFTSOFT

BYPASS BYPASS

OFF

KNEE KNEE

RANGERANGE

30 3010 1020 205 515 150 010 105 56 610 104 42 21 1dB dB

GAIN REDUCTION GAIN REDUCTIONOUTPUT LEVEL OUTPUT LEVEL

TwoPlusTwo

DYNAMICS

DSL424

DRAWMER

EXTEXT

BYPASSBYPASS

GATEGATE

KEY

LISTEN

KEY

LISTEN

INTINT

HzHz HzHz dBdB

200200 2525

500500

1010

2020

10mS10mS

1K1K

100100

250250

150150

2K2K

500500

5K5K

1K1K

10K10K

3K53K5

2K2K

35K35K

Master

7070

5S5S

4S4S

2S2S

1S1S

6060

1010

2020

3030

4040

5050

90dB90dB 20dB20dB

LINK

GATINGGATING

L.F. L.F.L.F. FILTER FILTERFILTER H.F. H.F.H.F. THRESH THRESHTHRESH RELEASE RELEASERELEASE

KEY SOURCE KEY SOURCEOUTPUT OUTPUT

THRESH THRESHRATIO RATIOGAIN GAINLEVEL LEVEL

COMPRESSOR 1 PEAK COMPRESSOR 2 PEAK

dB dBdB dBdB dB:1 :1

30 30

10 10

40 40

20 20

40 40

16 16

15 15

5 5

20 20

5 5

10 10

3 3

0 0

2 2

10 10

1.5 1.5

20 20

1.2 1.2

Drawmer DSL424 User manual

Brand: Drawmer

Model: DSL424

Category: Audio mixers

Type: User manual

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Drawmer DSL424 User manual

Drawmer DSL424 User manual

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